package net.simonvt.menudrawer.samples;

import net.simonvt.menudrawer.MenuDrawer;
import net.simonvt.menudrawer.Position;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.TextView;
import java.util.ArrayList;

public class ViewPagerSample extends BaseListSample {

	private PagerAdapter mPagerAdapter;
	private ViewPager mViewPager;
	private int mPagerOffsetPixels;
	private int mPagerPosition;

	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
	@SuppressLint("NewApi")
	@Override
	protected void onCreate(Bundle inState) {
		super.onCreate(inState);

		mMenuDrawer.setContentView(R.layout.activity_viewpagersample);
		mMenuDrawer.setSlideDrawable(R.drawable.ic_drawer);
		mMenuDrawer.setDrawerIndicatorEnabled(true);

		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
			getActionBar().setDisplayHomeAsUpEnabled(true);
		}

		mMenuDrawer.setTouchMode(MenuDrawer.TOUCH_MODE_FULLSCREEN);
		mMenuDrawer.setOnInterceptMoveEventListener(new MenuDrawer.OnInterceptMoveEventListener() {
			@Override
			public boolean isViewDraggable(View v, int dx, int x, int y) {
				if (v == mViewPager) {
					return !(mPagerPosition == 0 && mPagerOffsetPixels == 0) || dx < 0;
				}
				return false;
			}
		});

		mViewPager = (ViewPager) findViewById(R.id.view_pager);
		mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
			@Override
			public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
				mPagerPosition = position;
				mPagerOffsetPixels = positionOffsetPixels;
			}
		});

		mPagerAdapter = new PagerAdapter(this);
		mPagerAdapter.addTab(TextViewFragment.class, null);
		mPagerAdapter.addTab(TextViewFragment.class, null);
		mPagerAdapter.addTab(TextViewFragment.class, null);

		mViewPager.setAdapter(mPagerAdapter);
	}

	@Override
	protected void onMenuItemClicked(int position, Item item) {
		mMenuDrawer.closeMenu();
	}

	@Override
	protected int getDragMode() {
		return MenuDrawer.MENU_DRAG_CONTENT;
	}

	@Override
	protected Position getDrawerPosition() {
		return Position.LEFT;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case android.R.id.home:
			mMenuDrawer.toggleMenu();
			return true;
		}

		return super.onOptionsItemSelected(item);
	}

	@Override
	public void onBackPressed() {
		final int drawerState = mMenuDrawer.getDrawerState();
		if (drawerState == MenuDrawer.STATE_OPEN || drawerState == MenuDrawer.STATE_OPENING) {
			mMenuDrawer.closeMenu();
			return;
		}

		super.onBackPressed();
	}

	/**
	 * This is a helper class that implements the management of tabs and all
	 * details of connecting a ViewPager with associated TabHost. It relies on a
	 * trick. Normally a tab host has a simple API for supplying a View or
	 * Intent that each tab will show. This is not sufficient for switching
	 * between pages. So instead we make the content part of the tab host 0dp
	 * high (it is not shown) and the TabsAdapter supplies its own dummy view to
	 * show as the tab content. It listens to changes in tabs, and takes care of
	 * switch to the correct paged in the ViewPager whenever the selected tab
	 * changes.
	 */
	public static class PagerAdapter extends FragmentPagerAdapter {

		private final Context mContext;
		private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

		static final class TabInfo {

			private final Class<?> mClss;
			private final Bundle mArgs;

			TabInfo(Class<?> aClass, Bundle args) {
				mClss = aClass;
				mArgs = args;
			}
		}

		public PagerAdapter(FragmentActivity activity) {
			super(activity.getSupportFragmentManager());
			mContext = activity;
		}

		@Override
		public int getCount() {
			return mTabs.size();
		}

		@Override
		public Fragment getItem(int position) {
			TabInfo info = mTabs.get(position);
			return Fragment.instantiate(mContext, info.mClss.getName(), info.mArgs);
		}

		public void addTab(Class<?> clss, Bundle args) {
			TabInfo info = new TabInfo(clss, args);
			mTabs.add(info);
			notifyDataSetChanged();
		}

	}

	public static class TextViewFragment extends Fragment {

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
			FrameLayout frameLayout = new FrameLayout(getActivity());
			frameLayout.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT, Gravity.CENTER));

			TextView tv = new TextView(getActivity());
			tv.setText("This is an example of a Fragment in a View Pager");
			frameLayout.addView(tv);
			return frameLayout;
		}
	}
}
